G25 is a material grade of gray cast iron defined in Italy standard UNI 5007. It is the most commonly used gray cast iron alloy.

The followings are the applications, chemical composition, characteristics, mechanical properties, and equivalent grades for UNI 5007 G25 gray cast iron.

Application of UNI 5007 G25 gray cast iron:
It is suitable for all types of mechanical parts that are not subject to high mechanical stress. Therefore, it is very suitable for stove bars of old steam locomotives and g-bars and bridges for steam-powered ships and railings. It can also be used for the manufacture of cylinders, bases, machine beds, flywheels, cylinder liners, pistons, brake wheels, gearboxes, pressure valves, coupling plates, and others.

Chemical composition and characteristics for UNI 5007 G25 gray cast iron:
G25 cast iron is an iron-carbon alloy with a carbon content that varies from 3.2% to 3.5%.
In addition to carbon the alloy is also composed of silicon (1.9 to 2.1 %), manganese (0.65 to 0.8 %) and sulphur (up to 0.1 %).
Carbon is in the form of flakes or scales.
The characteristics of G25 cast iron depend on the dimensions and shape of the graphite flakes.
The main properties of G25 cast iron include good tensile strength and hardness.
It also has very good vibration damping and absorption properties thanks to the graphite flakes, stiffness and low friction coefficient.

Mechanical properties for UNI 5007 G25 gray cast iron:
From Italy UNI 5007 1969

Cross reference table for Cast iron G25 (UNI) and its European equivalent EN-GJL-250 (EN-JL1040) (EN)

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